Abstract
There are two basic types of symmetric algorithms: block ciphers and stream ciphers. Block ciphers operate on blocks of plaintext and ciphertext—usually of 64 bits but sometimes longer. Stream ciphers operate on streams of plaintext and ciphertext one bit or byte (sometimes even one 32-bit word) at a time. With a block cipher, the same plaintext block will always encrypt to the same ciphertext block, using the same key. With a stream cipher, the same plaintext bit or byte will encrypt to a different bit or byte every time it is encrypted. In this paper we introduce three developments of Counter Mode of Operation of Block cipher. These developments merge between advantages of Counter Mode with other Modes. This gives a good secure Modes for General purpose block-oriented transmission Authentication, Random access, Stream-oriented transmission over noisy channel.
Highlights
A cryptographic mode usually combines the basic cipher, some sort of feedback, and some simple operations
In this paper we introduce three developments of Counter Mode of Operation of Block cipher
If you want to transmit a DES key securely, electronic codebook (ECB) is the appropriate mode to use.The most significant characteristic of ECB is that the same b-bit block of plaintext, if it appears more than once in the message, always produces the same ciphertext
Summary
A cryptographic mode usually combines the basic cipher, some sort of feedback, and some simple operations. There are other security considerations: Patterns in the plaintext should be concealed, input to the cipher should be randomized, manipulation of the plaintext by introducing errors in the ciphertext should be difficult, and encryption of more than one message with the same key should be possible. If you want to transmit a DES key securely, ECB is the appropriate mode to use.The most significant characteristic of ECB is that the same b-bit block of plaintext, if it appears more than once in the message, always produces the same ciphertext
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